Description
The operation of closing the circuit breaker MVS3-12 (ZN63M) is carried out due to the traction force of the closing spring. The circuit breaker is tripped (including automatic shutdown at short-circuit currents or overloads) due to the energy stored by the circuit breaker springs when turned on. Arc extinction in the circuit breaker is carried out by vacuum interrupter chambers (VI).
The electric arc, due to the special shape of the contacts creating their own longitudinal (axial) magnetic field with a diffuse form of arc burning, decays and is extinguished. Due to the high dielectric strength of the vacuum gap, fractions of microseconds between contacts restore voltage.
The circuit breaker consists of three poles fixed to the circuit breaker housing. All body parts of the high-voltage part of the circuit breaker are made of insulating material, which allows it to be embedded in cells with limited space of the high-voltage compartment. Each pole contains a vacuum arrester, a mechanism for additional preloading of the VI contacts and current outputs.
The circuit breaker MVS3-12 (ZN63M) is equipped with a spring drive with low current consumption. A spring-loaded drive consists of an electric motor for charging a spring, a switching spring, an switching magnet, a block of mechanical latches, a damping hydraulic device, and a breaking electromagnet. The electrical circuit of the power supply and control circuit breaker is assembled on a panel mounted in the drive housing.
METTZ Group offer to our customers more than 50 modifications and types of VCB design.
